Is200 Catalytic Converter

[John Lee]

Hi all,

any idea what's the factory specs lifespan of the main cat converter in our IS200 ?

[Monster-Mat]

mine lasted 1 year, the precats 6 months

[John Lee]

hi Supracharged-IS340,

that's fast. btw, how to tell whether the cat converters r 'dead' ?

[Monster-Mat]

on mine when the precats failed, the car became sluggish.......

when the main cat failed the engine warning lights along with the Trac/Snow/ABS lights all illuminated

[Chris.S]

Is this something I've got to look forward to Mat ?

[John Lee]

Hi Supracharged-IS340,

thanks very much for the info :)

[gds]

the life of all cats is mileage not age dependent under average driving conditions, eg the original cat on a merc is good for 100k miles in the uk. cheers gds :) :)

[dark_is200]

the life of all cats is mileage not age dependent under average driving conditions, eg the original cat on a merc is good for 100k miles in the uk. cheers gds :) :)

if your car is supercharged the higher EGT's get through the cats much more quickly.

[Monster-Mat]

chris you dont have pre cats

[Chris.S]

chris you dont have pre cats

I meant the main cat Mat

[gds]

supercharged or not mileage is about fuel burnt which is about gas created, in any case, the question was about an is200. if the toyota cat spec is up to mb the life should be 100k miles but why not ask toyota/lexus, cheers, gds :) :)

[Monster-Mat]

the pre cats are known to break up prematurely, thereby blocking the exhaust causing hot spots on the main cat.

chris you should be fine

[dark_is200]

supercharged or not mileage is about fuel burnt which is about gas created, in any case, the question was about an is200. if the toyota cat spec is up to mb the life should be 100k miles but why not ask toyota/lexus, cheers, gds :) :)

i know of two is200's that have had problems with the cats' after very few miles, both of which were supercharged - think the extra heat causes them to break up

[Monster-Mat]

imagine a toilet roll,.......push the cardboard tube in the middle, it starts to extend and uncoil.

thats what happens to the pre-cats, and not just on S/C cars

quite a well known problem in Germany, this then generates more heat...causing them to break up........

the main cat is of a honeycomb construction, so doesnt suffer the same strsses, or weakness's

[imi]

Chris Shipley Posted on Jun 11 2003, 09:07 PM

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QUOTE (Supracharged-IS340 @ Jun 11 2003, 10:03 PM)

chris you dont have pre cats 

I meant the main cat Mat 

Questions for Mat or Chirs:

1st, how did you remove the pre-cats?

2nd, what difference does it make?

3rd, is it recommended to get them removed?

thanks

[Chris.S]

Mine were removed by TTE when I had my compressor fitted

[imi]

Chris,

did they use a certain type of replacement pipes for these or can we get them done from any local place who customize their own exhausts for you (i know a place who make a Powerflow set up)..

[Chris.S]

No they just took the insides out of the original system

[imi]

Any idea how that is done then Chris?

Also how can i get mine checked out if the pre cats have gone or not, as i am just past the 70K mark?

(sorry for the 50 questions)

[Chris.S]

mats the best one to ask, but I do know the manifold assembly has to be removed

[TonyGoose]

If they're broken up, then you 'might' be able to knock them out ..

if you have a very long implement that goes round bends :D

Otherwise, cut the cannisters open and remove the contents.

Then weld them closed again. Looks nice and standard

Actually, thinking about it, pipework is probably aluminised ...

So, you'll probably need to braze it back together rather than weld <_<

[GXE10]

by removing the precat, will it make your exhaust louder? and will it affect the emission?

[dark_is200]

by removing the precat, will it make your exhaust louder? and will it affect the emission?

i have had the precats removed, didn't notice any change to the exhaust sound. emissions are not a problem - i had an MOT a few months ago and passed without any problems at all so the main cat is ok on its own. These were the apporimxate numbers for the MOT, can't remember what the tests measure but anyway:

Test 1

Pass = 1.5% mycar =0.3%

Test 2

Pass = 200ppm mycar = 68ppm

I will be changing the main cat to an HKS sports model shortly (just waiting to get it fitted)

[imi]

Dark IS, where di you get the pre-cats taken out from?

[maferga]

You can also remove all three cats, but probably won't pass the tests ?

I have no problems on this matters where I live.

By doing so you will need an o2 simulator or equivalent; it is sold in the USA by Toyomoto:

www.toyomoto.com